Component Functions; Tap Handles; Product Concentrate Pump - Cornelius NITROPRO MINI Service And Preventative Maintenance Manual

Nitropro Mini Service Manual
3.0 SYSTEM OPERATION (Cont.)

3.3 Component Functions

3.3.1 Tap Handles

The dispensing tap handles (Fig.3-5), when pulled,
activate microswitches (Fig. 3-6) that signal the
Main PCB to activate specific components, as de-
scribed previously in section 3.2.
Figure 3-5 - Tap Handles / Microswitch Assemblies
Figure 3-6 - Microswitch Assembly
3.3.2 Coffee Concentrate Pump
This pump (Fig.3-7) draws coffee concentrate
from the chilled Bag In Box (BIB) and meters it to
the mixing manifold at a specific, user-selected
ratio to the input water (which is supplied at a
fixed pressure and flow rate).
Mixing ratios are adjusted by changing the DIP
switch settings on the Main PCB mounted
beneath the cabinet, as shown in Figure 3-8.
Adjustment of these settings changes the speed
of the peristaltic pump to provide more or less
concentrate per unit time.
Publication Number: 548000106SER
Figure 3-7 - Concentrate Pump
Figure 3-8 - Ratio Select Switch & Tuning Buttons
The selectable ratios provide, from one gallon of
concentrate, the coffee yields shown in Table
3-1. (NOTE: Select one ratio - one switch ON.)
Table 3-1 - Concentrate Pump Ratios
Main PCB
Ratio
Switch Setting
3:1 Switch 1 ON
4:1 Switch 2 ON
5:1 Switch 3 ON
7:1 Switch 4 ON
Ratio Tuning Buttons: One press of a button
changes the pump motor speed by 5 RPMs (or by
0.02 - 0.08 of the average TDS value).
The peristaltic pump is driven by a 24V DC servo
motor. A maintenance kit for the pump includes a
replacement pump hose with nipple ends.
- 10 -
Concentrate Coffee Yield
Gallons Gallons
1 4
1 5
1 6
1 8
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